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Organization, Basis of Presentation, and Summary of Significant Accounting Policies Repurchase Commitments (Details) | 12 Months Ended
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Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) unit | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) Members | Jun. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) dealer | Jun. 30, 2016 USD ($) Members | Jun. 30, 2015 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Repurchase Units, Number |  | 3 |  | 0 |  |  | 3 |
Repurchase Dealers, Number |  |  |  |  |  | 2 | 2 |
Impairment of Long-Lived Assets to be Disposed of |  |  | $ 0 |  | $ 0 |  |  | $ 0
Impairment of Intangible Assets (Excluding Goodwill) |  |  | 0 |  | 0 |  |  | $ 0
Floor Financing, Repurchase Obligations | $ 107,923,000 | $ 107,923,000 | $ 107,923,000 | $ 107,923,000 | $ 80,429,000 | $ 80,429,000 | $ 80,429,000 |
Repurchase Commitments, Period | 2 years 6 months |  |  |  |  |  |  |

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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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